# Programming Tutorials

## sum of all digits in a given number using Shell Script

By: Dorris Printer Friendly Format

This shell script prints the given number's sum of all digits, For eg. If no is 123 it's sum of all digit will be 1+2+3 = 6. ```#!/bin/bash # # Linux Shell Scripting Tutorial 1.05r3, Summer-2002 # # Written by Vivek G. Gite <vivek@nixcraft.com> # # Latest version can be found at http://www.nixcraft.com/ # # Algo: # 1) Input number n # 2) Set sum=0, sd=0 # 3) Find single digit in sd as n % 10 it will give (left most digit) # 4) Construct sum no as sum=sum+sd # 5) Decrment n by 1 # 6) Is n is greater than zero, if yes goto step 3, otherwise next step # 7) Print sum # if [ \$# -ne 1 ] then echo "Usage: \$0 number" echo " I will find sum of all digit for given number" echo " For eg. \$0 123, I will print 6 as sum of all digit (1+2+3)" exit 1 fi n=\$1 sum=0 sd=0 while [ \$n -gt 0 ] do sd=`expr \$n % 10` sum=`expr \$sum + \$sd` n=`expr \$n / 10` done echo "Sum of digit for numner is \$sum" ```

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